Date & Time

Interval Timer

Set active and rest durations, rounds, and an optional preparation countdown, then run the sequence locally in your browser.

Active seconds

Rest seconds

Rounds

Preparation seconds

00:00:10

Preparation · Round 1 of 8

—Total planned time

0%Sequence complete

How to use this Interval Timer

Set active and rest durations, rounds, and an optional preparation countdown, then run the sequence locally in your browser.

Run repeating active/rest intervals with configurable rounds and preparation time.

Browser timers can be delayed by background throttling, device sleep, muted audio, or closed tabs; keep the timer visible when timing matters.